<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div>1</div>
    <div>2</div>
    <div>3</div>
</body>
</html>
<script>
let str0 = new String("ok");
let str1 = "ok";
console.log(str0);
console.log(str1);
</script>